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Related Concept Videos

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
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Related Experiment Video

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Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
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Tissue motion due to needle deflection.

A Leibinger, C Burrows, M J Oldfield

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 7, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Flexible bending needles cause greater tissue displacement than rigid needles, especially along curved paths. This motion must be considered for accurate steerable needle insertion in minimally invasive surgery.

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    Area of Science:

    • Medical Devices
    • Robotics
    • Surgical Technology

    Background:

    • Minimally invasive surgery (MIS) requires precise instrument control.
    • Steerable needles offer potential for complex trajectories in MIS.
    • Accurate control of steerable needles necessitates understanding tissue interaction.

    Purpose of the Study:

    • To compare tissue motion induced by flexible bending needles versus rigid straight needles.
    • To quantify the relative substrate motion around inserted needles.
    • To inform the control strategies for steerable needles in MIS.

    Main Methods:

    • Experimental investigation using a homogeneous tissue phantom.
    • Laser-based setup for measuring substrate displacements around needles.
    • Transformation of displacements into a local frame for relative motion quantification.

    Main Results:

    • Flexible bending needles induce greater radial tissue displacement compared to rigid needles.
    • The radial displacement effect increases with higher path curvatures.
    • Relative substrate motion is a critical factor influenced by needle flexibility and trajectory.

    Conclusions:

    • Tissue motion around steerable needles is significant and dependent on needle design and curvature.
    • Accounting for needle-induced tissue motion is crucial for reducing placement errors in complex MIS procedures.
    • This research provides essential data for developing advanced control algorithms for steerable needles.